Vitamin B12 Injections for Aging and Longevity InVita Wellness Learn how to administer your own SubQ (subcutaneous) injections at home with confidence. Our step by step guide covers everything you need to know, from preparing your supplies to safely injecting the medication. Our Subcutaneous (SC) and Intramuscular (IM) Injections Must Knows for Subcutaneous administration: Pinch skin with non dominant hand and hold syringe with dominant hand Always inject: 2 inches away from umbilicus (for abdomen) 3 inches Injection Techniques: Injection Routes & Angles Intradermal (ID) 1015 just under the skin (dermis) Subcutaneous (SC) 45 into fat Intravenous (IV) 25 How to Give a B12 Injection: Step By Step Instructions